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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Specific cases are needed, and the language to actually note this issue, otherwise it can't be addressed.
Added a test with a letter in it, hopefully it'll fix it.
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Some randomly generated e-mail addresses are falsly flagged as badly formatted according to the kata's own rules. Should be testing true (valid), but marked false (invalid).